Clinical Research Directory

Inclusion Criteria: * Age 18-30 years. * Able to provide independent written informed consent. * Able to read and speak English. * Generally healthy and maintains a regular sleep schedule. * Willing and able to use the wearable EEG system at home during sleep and complete smartphone-based assessments. * Adequate hearing to perceive the auditory stimulation. * Able to follow device-use, safety-reporting, and study procedures. Exclusion Criteria: * Diagnosed sleep disorder, including insomnia or sleep apnea. * Diagnosed psychiatric condition, including major depressive disorder or an anxiety disorder. * Neurological disorder, including epilepsy, seizure disorder, or significant traumatic brain injury. * Hearing impairment that would interfere with auditory stimulation. * Use of medication expected to substantially affect sleep, mood, or study outcomes, including sedative-hypnotic or relevant psychoactive medication. * Known allergy or sensitivity to device materials, adhesives, conductive materials, or other skin-contact components. * Current pregnancy. * Cognitive impairment or another condition preventing independent consent. Prisoner status. * Student or employee over whom the investigator or study personnel have direct grading, supervisory, employment, or evaluative authority. * Acute illness, dizziness, significant headache or earache, excessive fatigue, or another temporary safety or data-quality concern at the time of study procedures. Participation may be deferred or rescheduled when appropriate.